Curved display device having domains of liquid crystal molecules aligned in different directions

ABSTRACT

A curved display device including a display substrate, an opposite substrate, a liquid crystal layer, a pixel electrode, a common electrode, and a light blocking layer. The display substrate includes pixel areas included in a display area, and is curved along a first direction. The opposite substrate faces the display substrate and is coupled to the display substrate to be curved together with the display substrate. Domains are defined in each pixel area and arranged in a second direction crossing the first direction. Liquid crystal molecules in a first set of two domains, which are sequentially arranged and disposed adjacent to the light blocking layer, are aligned toward a first side of the display area, and liquid crystal molecules in a second set of two domains facing the first set of two domains are aligned toward the second side of the display area.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority from and the benefit of Korean PatentApplication No. 10-2014-0017339, filed on Feb. 14, 2014, which is herebyincorporated by reference for all purposes as if fully set forth herein.

BACKGROUND

Field

Exemplary embodiments of the present disclosure relate to a curveddisplay device. More particularly, exemplary embodiments of the presentdisclosure relate to a curved display device having a curved displayarea.

Discussion of the Background

A flat panel display device has been widely applied to variousinformation-processing devices, such as a television set, a monitor, anotebook computer, a mobile phone, etc., to display an image. In recentyears, a curved display device has been developed to improve athree-dimensional effect, sense of immersion, and presence of the imageprovided to a viewer.

The above information disclosed in this Background section is only forenhancement of understanding of the background of the inventive concept,and, therefore, it may contain information that does not constituteprior art.

SUMMARY

Exemplary embodiments provide a curved display device having improveddisplay quality.

Additional aspects will be set forth in the detailed description whichfollows, and, in part, will be apparent from the disclosure, or may belearned by practice of the inventive concept.

Exemplary embodiments of the inventive concept disclose a curved displaydevice including a display substrate, an opposite substrate, a liquidcrystal layer, a pixel electrode, a common electrode, and a lightblocking layer. The display substrate includes pixel areas defined in adisplay area, and is curved along a first direction when viewed in aplan view. The opposite substrate faces the display substrate, iscoupled to the display substrate, and is curved along the firstdirection together with the display substrate.

The liquid crystal layer is interposed between the display substrate andthe opposite substrate and the pixel electrode is disposed in each ofthe pixel areas. The common electrode is disposed on the oppositesubstrate and is configured to form an electric field in cooperationwith the pixel electrode, and the light blocking layer is disposed onone of the display substrate and the opposite substrate and isconfigured to block light.

Domains are defined in each of the pixel areas, and are arranged in asecond direction crossing the first direction. Among the domains, liquidcrystal molecules in a first set of two domains, which are sequentiallyarranged and disposed adjacent to the light blocking layer, are alignedin a direction toward one side of the display area, and liquid crystalmolecules in a second set of two domains, which face the first set oftwo domains while the light blocking layer is disposed between the firstand second sets of two domains, are aligned in a direction toward theother side of the display area.

The foregoing general description and the following detailed descriptionare exemplary and explanatory and are intended to provide furtherexplanation of the claimed subject matter.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the inventive concept, and are incorporated in andconstitute a part of this specification, illustrate exemplaryembodiments of the inventive concept, and, together with thedescription, serve to explain the principles of the inventive concept.

FIG. 1A is a perspective view showing a curved display device accordingto an exemplary embodiment of the present disclosure.

FIG. 1B is a plan view showing the curved display device shown in FIG.1A.

FIG. 1C is a side view showing the curved display device shown in FIG.1A.

FIG. 2 is a plan view showing a pixel of the curved display device shownin FIG. 1A.

FIG. 3A is a cross-sectional view taken along a line I-I′ of FIG. 2.

FIG. 3B is a cross-sectional view taken along a line II-II′ of FIG. 2.

FIG. 3C is a cross-sectional view taken along a line III-III′ of FIG. 2;

FIGS. 4A, 4B, 4C, and 4D are perspective views showing liquid crystalmolecules aligned by an electric field formed between a displaysubstrate and an opposite substrate.

FIG. 5 is a view showing domains and liquid crystal alignment directionsdefined in a pixel area.

FIG. 6 is an enlarged plan view showing a portion of a display area ofthe curved display device shown in FIG. 1B.

FIG. 7 is an enlarged plan view showing a portion of the display area ofthe curved display device shown in FIG. 1B.

DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS

In the following description, for the purposes of explanation, numerousspecific details are set forth in order to provide a thoroughunderstanding of various exemplary embodiments. It is apparent, however,that various exemplary embodiments may be practiced without thesespecific details or with one or more equivalent arrangements. In otherinstances, well-known structures and devices are shown in block diagramform in order to avoid unnecessarily obscuring various exemplaryembodiments.

In the accompanying figures, the size and relative sizes of layers,films, panels, regions, etc., may be exaggerated for clarity anddescriptive purposes. Also, like reference numerals denote likeelements.

When an element or layer is referred to as being “on,” “connected to,”or “coupled to” another element or layer, it may be directly on,connected to, or coupled to the other element or layer or interveningelements or layers may be present. When, however, an element or layer isreferred to as being “directly on,” “directly connected to,” or“directly coupled to” another element or layer, there are no interveningelements or layers present. For the purposes of this disclosure, “atleast one of X, Y, and Z” and “at least one selected from the groupconsisting of X, Y, and Z” may be construed as X only, Y only, Z only,or any combination of two or more of X, Y, and Z, such as, for instance,XYZ, XYY, YZ, and ZZ. Like numbers refer to like elements throughout. Asused herein, the term “and/or” includes any and all combinations of oneor more of the associated listed items.

Although the terms first, second, etc. may be used herein to describevarious elements, components, regions, layers, and/or sections, theseelements, components, regions, layers, and/or sections should not belimited by these terms. These terms are used to distinguish one element,component, region, layer, and/or section from another element,component, region, layer, and/or section. Thus, a first element,component, region, layer, and/or section discussed below could be termeda second element, component, region, layer, and/or section withoutdeparting from the teachings of the present disclosure.

Spatially relative terms, such as “beneath,” “below,” “lower,” “above,”“upper,” and the like, may be used herein for descriptive purposes, and,thereby, to describe one element or feature's relationship to anotherelement(s) or feature(s) as illustrated in the drawings. Spatiallyrelative terms are intended to encompass different orientations of anapparatus in use, operation, and/or manufacture in addition to theorientation depicted in the drawings. For example, if the apparatus inthe drawings is turned over, elements described as “below” or “beneath”other elements or features would then be oriented “above” the otherelements or features. Thus, the exemplary term “below” can encompassboth an orientation of above and below. Furthermore, the apparatus maybe otherwise oriented (e.g., rotated 90 degrees or at otherorientations), and, as such, the spatially relative descriptors usedherein interpreted accordingly.

The terminology used herein is for the purpose of describing particularembodiments and is not intended to be limiting. As used herein, thesingular forms, “a,” “an,” and “the” are intended to include the pluralforms as well, unless the context clearly indicates otherwise. Moreover,the terms “comprises,” comprising,” “includes,” and/or “including,” whenused in this specification, specify the presence of stated features,integers, steps, operations, elements, components, and/or groupsthereof, but do not preclude the presence or addition of one or moreother features, integers, steps, operations, elements, components,and/or groups thereof.

Various exemplary embodiments are described herein with reference tosectional illustrations that are schematic illustrations of idealizedexemplary embodiments and/or intermediate structures. As such,variations from the shapes of the illustrations as a result, forexample, of manufacturing techniques and/or tolerances, are to beexpected. Thus, exemplary embodiments disclosed herein should not beconstrued as limited to the particular illustrated shapes of regions,but are to include deviations in shapes that result from, for instance,manufacturing. For example, an implanted region illustrated as arectangle will, typically, have rounded or curved features and/or agradient of implant concentration at its edges rather than a binarychange from implanted to non-implanted region. Likewise, a buried regionformed by implantation may result in some implantation in the regionbetween the buried region and the surface through which the implantationtakes place. Thus, the regions illustrated in the drawings are schematicin nature and their shapes are not intended to illustrate the actualshape of a region of a device and are not intended to be limiting.

Unless otherwise defined, all terms (including technical and scientificterms) used herein have the same meaning as commonly understood by oneof ordinary skill in the art to which this disclosure is a part. Terms,such as those defined in commonly used dictionaries, should beinterpreted as having a meaning that is consistent with their meaning inthe context of the relevant art and will not be interpreted in anidealized or overly formal sense, unless expressly so defined herein.

Hereinafter, the present invention will be explained in detail withreference to the accompanying drawings.

Referring to FIGS. 1A, 1B, and 1C, the curved display device 500includes a display area DA in which an image is displayed and has acurved shape. Accordingly, the curved display device 500 may display theimage having an enhanced three-dimensional effect, a sense of immersionand presence using the curved display area DA.

The curved display device 500 may be, a liquid crystal display device.The curved display device 500 includes a display substrate 100, anopposite substrate 300, and a liquid crystal layer LC disposedtherebetween, as shown in FIG. 3A. The opposite substrate 300 faces thedisplay substrate 100 and is coupled to the display substrate 100, andthe liquid crystal layer is disposed between the display substrate 100and the opposite substrate 300.

The curved display device 500 may further include other elements, inaddition to the display substrate 100 and the opposite substrate 300.For instance, the curved display device 500 may further include abacklight assembly (not shown) to provide light to the display substrate100 and the opposite substrate 300.

According to another exemplary embodiment, the curved display device 500may be an organic electroluminescent display device. In this case, thedisplay substrate 100 includes pixels, each including an anode, acathode, and an organic light emitting layer disposed between the anodeand the cathode, and the opposite substrate 300 is coupled to thedisplay substrate 100 to seal the pixels.

In the present exemplary embodiment, a portion or all of the curveddisplay device 500 is curved along a first direction D1 on a planesurface, and the first direction D1 is substantially in parallel to alongitudinal direction of the curved display device 500. Accordingly,the display area DA has the curved shape along the first direction D1.In addition, the opposite substrate 300 has the same curved shape asthat of the display substrate 100.

As shown in FIG. 1C, when a first point P1 is defined at a curvedportion of the display substrate 100 on the side surface of the displaysubstrate 100, a normal line 10 crossing the first point P1 crosses asecond point P2 of the opposite substrate 300. In addition, a gaze line15, which is substantially in parallel to a user's view direction, isdefined at the first point P1, and the gaze line 15 crosses a thirdpoint P3 of the opposite substrate 300. In this case, because thedisplay substrate 100 and the opposite substrate 300 have the curvedshape, the second point P2 may be different from the third point P3 inthe opposite substrate 300.

As described above, a phenomenon in which a distance occurs between thesecond point P2 and the third point P3 is called a misalignment betweenthe display substrate 100 and the opposite substrate 300 due to thecurved shape of the display substrate 100 and the opposite substrate300. Hereinafter, a structure of the curved display device 500, whichprevents a reduction in display quality of the image displayed in thedisplay area DA of the curved display device 500 as a result of themisalignment, will be described. In addition, a structure of the curveddisplay device 500, which prevents a horizontal line causing a reductionof the display quality, will be described.

FIG. 2 is a plan view showing a pixel of the curved display device 500shown in FIG. 1A, FIG. 3A is a cross-sectional view taken along a lineI-I′ of FIG. 2, FIG. 3B is a cross-sectional view taken along a lineII-II′ of FIG. 2, FIG. 3C is a cross-sectional view taken along a lineIII-III′ of FIG. 2.

The curved display device 500 includes the pixels arranged in pixelareas, but only one pixel area PA and a pixel electrode PE disposed inthe pixel area PA are shown in FIG. 2 since the pixels have the samestructure and function.

Referring to FIGS. 2, 3A, 3B, and 3C, the display substrate 100 includesa first base substrate S1, a gate line GL, a first data line DL1, asecond data line DL2, a first thin film transistor TR1, a second thinfilm transistor TR2, a pixel electrode PE, a first alignment layer 110,a first shielding electrode SCE1, and a second shielding electrode SCE2.

The first base substrate S1 may be a glass or plastic substrate. Thegate line GL is disposed on the first base substrate S1, and iselectrically connected to the first and second thin film transistors TR1and TR2, to apply a gate signal to the first and second thin filmtransistors TR1 and TR2.

In the present exemplary embodiment, the pixel area PA includes a firstsub-pixel area PA1 and a second sub-pixel area PA2. In this case, thepixel electrode PE includes a first sub-pixel electrode PE1 disposed inthe first sub-pixel area PA1, and a second sub-pixel electrode PE2disposed in the second sub-pixel area PA2.

The first and second data lines DL1 and DL2 are disposed on the firstbase substrate S1, and are insulated from the gate line GL. The firstdata line DL1 applies a first data signal to the first thin filmtransistor TR1, and the second data line DL2 applies a second datasignal to the second thin film transistor TR2. The first data line DL1extends along one side of the first and second sub-pixel electrodes PE1and PE2, and the second data line DL2 extends along the other side ofthe first and second sub-pixel electrodes PE1 and PE2. Thus, the firstand second sub-pixel electrodes PE1 and PE2 are arranged in the seconddirection D2 between the first and second data lines DL1 and DL2.

The first thin film transistor TR1 is electrically connected to the gateline GL, the first data line DL1, and the first sub-pixel electrode PE1.Thus, when the first thin film transistor TR1 is turned on in responseto the gate signal, the first data signal is applied to the firstsub-pixel electrode PE1.

The first thin film transistor TR1 includes a first gate electrode GE1,a first active pattern AP1, a first source electrode SE1, and a firstdrain electrode DE1. The first gate electrode GE1 is branched from thegate line GL, and the first active pattern AP1 is disposed on the firstgate electrode GE1 while a first insulating layer L1 is disposed betweenthe first active pattern AP1 and the first gate electrode GE1. The firstsource electrode SE1 is branched from the first data line DL1 to overlapwith the first active pattern AP1, and the first drain electrode DE1 isspaced apart from the first source electrode SE1 to overlap with thefirst active pattern AP1.

A second insulating layer L2 covers the first and second thin filmtransistors TR1 and TR2, and a third insulating layer L3 is disposed onthe second insulating layer L2 to relieve a step difference between thefirst and second thin film transistors TR1 and TR2.

The second thin film transistor TR2 is electrically connected to thegate line GL, the second data line DL2, and the second sub-pixelelectrode PE2. Thus, when the second thin film transistor TR2 is turnedon in response to the gate signal, the second data signal is applied tothe second sub-pixel electrode PE2.

The second thin film transistor TR2 includes a second gate electrodeGE2, a second active pattern AP2, a second source electrode SE2, and asecond drain electrode DE2. The second gate electrode GE2 is branchedfrom the gate line GL, and the second active pattern AP2 is disposed onthe second gate electrode GE2, while the first insulating layer L1 isdisposed between the second active pattern AP2 and the second gateelectrode GE2. The second source electrode SE2 is branched from thesecond data line DL2 to overlap with the second active pattern AP2, andthe second drain electrode DE2 is spaced apart from the second sourceelectrode SE2 to overlap with the second active pattern AP2.

The first and second sub-pixel electrodes PE1 and PE2 are disposed onthe third insulating layer L3. The first and second sub-pixel electrodesPE1 and PE2 make contact with the first and second drain electrodes DE1and DE2, respectively, through contact holes formed through the secondand third insulating layers L2 and L3.

In the present exemplary embodiment, each of the first and second activepatterns AP1 and AP2 may include a semiconductor material, such asamorphous silicon, crystalline silicon, etc. According to anotherexemplary embodiment, each of the first and second active patterns AP1and AP2 may include an oxide semiconductor, e.g., IGZO, ZnO, SnO₂,In₂O₃, Zn₂SnO₄, Ge₂O₃, and HfO₂, or a compound semiconductor, e.g.,GaAs, GaP, and InP.

When the first and second thin film transistors TR1 and TR2 are turnedon in response to the gate signal, the first data signal is applied tothe first sub-pixel electrode PE1 through the turned-on first thin filmtransistor TR1, and the second data signal is applied to the secondsub-pixel electrode PE2 through the turned-on second thin filmtransistor TR2. Accordingly, when the level of the first data signal isdifferent from the level of the second data signal, different grayscales are displayed in the first and second sub-pixel areas PA1 andPA2, respectively.

For example, in the present exemplary embodiment, the first and secondthin film transistors TR1 and TR2 are connected to the gate line GL.According to another exemplary embodiment, the first and second thinfilm transistors TR1 and TR2 may be electrically connected to differentgate lines in a one-to-one correspondence.

The first alignment layer 110 may be disposed above the first and secondsub-pixel electrodes PE1 and PE2 to make contact with the liquid crystallayer LC. When no electric field is applied to the liquid crystal layerLC, liquid crystal molecules RM (shown in FIGS. 4A to 4D) of the liquidcrystal layer LC are pre-tilted by the first alignment layer 110. Thus,when the electric field is applied to the liquid crystal layer LC, theliquid crystal molecules pre-tilted by the first alignment layer 110 arealigned in a direction substantially parallel to the display substrate100, so that a response time of the liquid crystal molecules operated inresponse to the electric field may be improved.

The first and second shielding electrodes SCE1 and SCE2 are spaced apartfrom the first and second sub-pixel electrodes PE1 and PE2, and aredisposed in a non-pixel area N-PA. The first and second shieldingelectrodes SCE1 and SCE2 extend in the second direction D2, and arerespectively overlapped with the first and second data lines DL1 andDL2. The first and second sub-pixel electrodes PE1 and PE2 are arrangedin the second direction D2 between the first and second shieldingelectrodes SCE1 and SCE2.

The first and second shielding electrodes SCE1 and SCE2 may form thesame electric potential with a common electrode CE. For instance, when avoltage of about 5 volts is applied to the common electrode CE, thevoltage of about 5 volts is applied to each of the first and secondshielding electrodes SCE1 and SCE2. Thus, the first and second shieldingelectrodes SCE1 and SCE2 form the same electric potential with thecommon electrode CE.

According to the first shielding electrode SCE1, because the firstshielding electrode SCE1 forms the same electric potential with thecommon electrode CE, as shown in FIG. 3C, a difference in electricpotential between the first shielding electrode SCE1 and the commonelectrode CE does not occur. As a result, the liquid crystal moleculesRM disposed between the first shielding electrode SCE1 and the commonelectrode CE are maintained in the alignment state determined by thefirst alignment layer 110 and a second alignment layer 310. Accordingly,a phase difference delay value of the light passing through the liquidcrystal molecules RM disposed to correspond to the first shieldingelectrode SCE1 becomes almost zero. Therefore, the light may be absorbedby polarizing plates respectively attached to the display substrate 100and the opposite substrate 300 and having absorption axes vertical toeach other.

According to the material used to form the first and second shieldingelectrodes SCE1 and SCE2, the first and second shielding electrodes SCE1and SCE2 may block the light in the non-pixel area N-PA instead of thelight blocking layer BM. For example, the first and second shieldingelectrodes SCE1 and SCE2 may be formed of an opaque conductive material.Therefore, the light blocking layer BM may be omitted in the area of thenon-pixel area N-PA, in which the first and second shielding electrodesSCE1 and SCE2 are disposed.

In the present exemplary embodiment, the first and second shieldingelectrodes SCE1 and SCE2 include a transparent conductive material,e.g., indium tin oxide. Thus, although at least one of the first andsecond shielding electrodes SCE1 and SCE2 may intrude on the first andsecond sub-pixel areas PA1 and PA2 due to the misalignment describedwith reference to FIGS. 1A to 1C, a deterioration in aperture ratio ofthe first and second sub-pixel areas PA1 and PA2 may be prevented as aresult of the first and second shielding electrodes SCE1 and SCE2.

The first sub-pixel electrode PE1 includes a first horizontal trunkportion HS1, a second horizontal trunk portion HS2, a first verticaltrunk portion VS1, a second vertical trunk portion VS2, and first,second, third, and fourth branch portions B1, B2, B3, and B4.

The first vertical trunk portion VS1 is connected to the firsthorizontal trunk portion HS1, edges of the first branch portions B1, andedges of the second branch portions B2, and the second vertical trunkportion VS2 is connected to the second horizontal trunk portion HS2,edges of the third branch portions B3, and edges of the fourth branchportions B4.

Each of the first and second vertical trunk portions VS1 and VS2 extendsin the second direction D2 crossing the first direction D1. In otherwords, the second direction D2 may be substantially perpendicular to thefirst direction D1 when viewed in a plan view.

The first horizontal trunk portion HS1 is connected to the firstvertical trunk portion VS1, the edges of the first branch portions B1,and the edges of the second branch portions B2. The first horizontaltrunk portion HS1 is branched from a center portion of the firstvertical trunk portion VS1 and extends in an opposite direction of thefirst direction D1. The first branch portions B1 have a symmetricalshape to that of the second branch portions B2 with respect to the firsthorizontal trunk portion HS1. Referring to FIG. 5, the first horizontaltrunk portion HS1 is disposed between a first domain DM1 and a seconddomain DM2.

The second horizontal trunk portion HS2 is connected to the secondvertical trunk portion VS2, edges of the third branch portions B3, andedges of the fourth branch portions B4. The second horizontal trunkportion HS2 is branched from a center portion of the second verticaltrunk portion VS2 and extends in the first direction D1. The thirdbranch portions B3 have a symmetrical shape to that of the fourth branchportions B4 with respect to the second horizontal trunk portion HS2.Referring to FIG. 5, the second horizontal trunk portion HS2 is disposedbetween a third domain DM3 and a fourth domain DM4.

A first portion of the first branch portions B1 is branched from thefirst horizontal trunk portion HS1, and a second portion of the firstbranch portions B1 is branched from the first vertical trunk portionVS1. In addition, each of the first branch portions B1 extends in asixth direction D6 inclined with respect to the first and seconddirections D1 and D2 when viewed in a plan view, and the first branchportions B1 spaced apart from each other.

A first portion of the second branch portions B2 is branched from thefirst horizontal trunk portion HS1, and a second portion of the secondbranch portions B2 is branched from the first vertical trunk portionVS1. In addition, each of the second branch portions B2 extends in afifth direction D6 inclined with respect to the first and seconddirections D1 and D2 when viewed in a plan view, and the second branchportions B2 are spaced apart from each other.

When viewed in a plan view, the fifth direction D5 may cross the sixthdirection D6. For instance, the fifth and sixth directions D5 and D6 maybe substantially perpendicular to each other when viewed in a plan view,and each of the fifth and sixth directions D5 and D6 forms an angle ofabout 45 degrees with either the first direction D1 or the seconddirection D2.

A first portion of the third branch portions B3 is branched from thesecond horizontal trunk portion HS2, and a second portion of the thirdbranch portions B3 is branched from the second vertical trunk portionVS2. In addition, each of the third branch portions B3 extends in afourth direction D4 inclined with respect to the first and seconddirections D1 and D2 in a plan view, and the third branch portions B3are spaced apart from each other.

A first portion of the fourth branch portions B4 is branched from thesecond horizontal trunk portion HS2 and a second portion of the fourthbranch portions B4 is branched from the second vertical trunk portionVS2. In addition, each of the fourth branch portions B4 extends in athird direction D3 inclined with respect to the first and seconddirections D1 and D2 in a plan view, and the fourth branch portions B4are spaced apart from each other.

When viewed in a plan view, the fourth direction D4 may cross the thirddirection D3. For instance, the third and fourth directions D3 and D4may be substantially perpendicular to each other when viewed in a planview, and each of the third and fourth directions D3 and D4 forms anangle of about 45 degrees with the first direction D1 or the seconddirection D2.

The second sub-pixel electrode PE2 may differ in size from the firstsub-pixel electrode PE1 while retaining the shape of the secondsub-pixel electrode PE2 may have a shape similar to a shape of the firstsub-pixel electrode PE1.

The second sub-pixel electrode PE2 includes third and fourth horizontaltrunk portions HS3 and HS4, third and fourth vertical trunk portions VS3and VS4, and fifth, sixth, seventh, and eighth branch portions B5, B6,B7, and B8.

The third vertical trunk portion VS3 extends in the second direction D2and is connected to the third horizontal trunk portion HS3, edges of thefifth branch portions B5, and edges of the sixth branch portions B6. Thefourth vertical trunk portion VS4 extends in the second direction D2,and is connected to the fourth horizontal trunk portion HS4, edges ofthe seventh branch portions B7, and edges of the eighth branch portionsB8.

The third horizontal trunk portion HS3 is branched from the thirdvertical trunk portion VS3 to extend in a direction opposite that of thefirst direction D1, and the fourth horizontal trunk portion HS4 isbranched from the fourth vertical trunk portion VS4 to extend in thefirst direction D1. In the present exemplary embodiment, the thirdhorizontal trunk portion HS3 is branched from a center portion of thethird vertical trunk portion VS3, and the fourth horizontal trunkportion HS4 is branched from a center portion of the fourth verticaltrunk portion VS4.

A first portion of the fifth branch portions B5 is branched from thethird horizontal trunk portion HS3, and a second portion of the fifthbranch portions B5 is branched from the third vertical trunk portionVS3. In addition, each of the fifth branch portions B5 extends in thesixth direction D6 in a plan view, and the fifth branch portions B5 arespaced apart from each other.

A first portion of the sixth branch portions B6 is branched from thethird horizontal trunk portion HS3, and a second portion of the sixthbranch portions B6 is branched from the third vertical trunk portionVS3. In addition, each of the sixth branch portions B6 extends in thefifth direction D5 in a plan view, and the sixth branch portions B6 arespaced apart from each other.

A first portion of the seventh branch portions B7 is branched from thefourth horizontal trunk portion HS4, and a second portion of the seventhbranch portions B7 is branched from the fourth vertical trunk portionVS4. In addition, each of the seventh branch portions B7 extends in thefourth direction D4 in a plan view, and the seventh branch portions B7are spaced apart from each other.

A first portion of the eighth branch portions B8 is branched from thefourth horizontal trunk portion HS4, and a second portion of the eighthbranch portions B8 is branched from the fourth vertical trunk portionVS4. In addition, each of the eighth branch portions B8 extends in thethird direction D3 in a plan view, and the eighth branch portions B8 arearranged to be spaced apart from each other.

When the first to eighth branch portions B1 to B8 have theabove-mentioned structure, first, second, third, and fourth domains DM1,DM2, DM3, DM4 (refer to FIG. 5) are defined in the first sub-pixel areaPA1 and fifth, sixth, seventh, and eighth domains DM5, DM6, DM7, and DM8(refer to FIG. 5) are defined in the second sub-pixel area PA2.Descriptions of the above will be described in detail with reference toFIGS. 4A to 4D, and FIG. 5.

In addition, in the case that the first to eighth domains DM1 to DM8 aredefined in the first and second sub-pixel areas PA1 and PA2, the firstsub-pixel electrode PE1 further includes a first domain connection partLP1, and the second sub-pixel electrode PE2 further includes a secondconnection part LP2, as shown in FIG. 2.

The first domain connection part LP1 is disposed between the seconddomain DM2 and the third domain DM3, and connects the second and thirdbranch portions B2 and B3. The second domain connection part LP2 isdisposed between the sixth domain DM6 and the seventh domain DM7, andconnects the sixth and seventh branch portions B6 and B7. In the presentexemplary embodiment, the first domain connection part LP1 is disposedat a center portion of a border area between the second and thirddomains DM2 and DM3, and the second domain connection part LP2 isdisposed at a center portion of a border area between the sixth andseventh domains DM6 and DM7.

The opposite substrate 300 includes a second base substrate S2, thecommon electrode CE, the light blocking layer BM, a color filter CF, andthe second alignment layer 310. The second base substrate S2 may be aglass or plastic substrate.

The common electrode CE is disposed on the second base substrate S2 soas to form the electric field to be applied to the liquid crystal layerLC in cooperation with the pixel electrode PE. The light blocking layerBM is disposed on the second base substrate S2 to block the lightexiting from the liquid crystal layer LC. The light blocking layer BM isdisposed in the non-pixel area N-PA disposed between the first sub-pixelarea PA1 and the second sub-pixel area PA2, and extends in the firstdirection D1.

The color filter CF is disposed on the second base substrate S2 andfaces the first and second sub-pixel areas PA1 and PA2 so as to filterthe light exiting from the liquid crystal layer LC and provide a colorto the light. For example, in the present exemplary embodiment, thecolor filter CF is disposed on the second base substrate S2. Accordingto another exemplary embodiment, the color filter CF may be disposed onthe first base substrate S1 to face the first and second sub-pixel areasPA1 and PA2.

The second alignment layer 310 is disposed above the common electrode CEand contacts the liquid crystal layer LC. When no electric field isapplied to the liquid crystal layer LC, the liquid crystal molecules RM(refer to FIGS. 4A to 4D) of the liquid crystal layer LC are pre-tiltedby the second alignment layer 310. Thus, when the electric field isapplied to the liquid crystal layer LC, the liquid crystal moleculespre-tilted by the second alignment layer 310 are aligned in a directionsubstantially in parallel to the opposite substrate 300. Thus, aresponse time of the liquid crystal molecules operated in response tothe electric field may be improved.

FIGS. 4A to 4D are perspective views showing the liquid crystalmolecules aligned by the electric field formed between the displaysubstrate and the opposite substrate, and FIG. 5 is a view showing thedomains and the liquid crystal alignment directions defined in the pixelarea.

In more detail, FIG. 4A is a perspective view showing an alignment stateof the liquid crystal molecules disposed in the first branch portionsB1; FIG. 4B is a perspective view showing an alignment state of theliquid crystal molecules disposed in the second branch portions B2; FIG.4C is a perspective view showing an alignment state of the liquidcrystal molecules disposed in the third branch portions B3; and FIG. 4Dis a perspective view showing an alignment state of the liquid crystalmolecules disposed in the fourth branch portions B4.

Referring to FIGS. 4A and 5, the first branch portions B1 extend in thethird direction D3. When no electric field is formed between the displaysubstrate 100 (refer to FIG. 3A) and the opposite substrate 300 (referto FIG. 3A), a first portion of the liquid crystal molecules RM, whichis adjacent to the first alignment layer 110, is aligned and inclined ata first pre-tilt angle A1 by the first alignment layer 110, and a secondportion of the liquid crystal molecules RM, which is adjacent to thesecond alignment layer 310, is aligned and inclined at the firstpre-tilt angle A1 by the second alignment layer 310.

When a direction in which the liquid crystal molecules RM are aligned bythe first alignment layer 110 on a plane surface is referred to as afirst lower alignment direction LD1, and a direction in which the liquidcrystal molecules RM are aligned by the second alignment layer 310 on aplane surface is referred to as a first upper alignment direction UD1,the first upper alignment direction UD1 and the first lower alignmentdirection LD1 are substantially parallel to the third direction D3. Thatis, the first lower alignment direction LD1 and the first upperalignment direction UD1 are the same.

When the electric field is formed, the liquid crystal molecules RM arefurther inclined by the electric field, and thus, the liquid crystalmolecules RM are aligned in the third direction D3 to be substantiallyparallel to the first branch portions B1 in a plan view. That is, theliquid crystal molecules pre-tilted by the first and second alignmentlayers 110 and 130 are further inclined toward the third direction D3 bythe electric field.

In contrast to the present exemplary embodiment, when the first upperalignment direction UD1 is different from the first lower alignmentdirection LD1, the liquid crystal molecules RM disposed adjacent to thefirst and second alignment layers 110 and 310 may be aligned in andinclined to different directions. In this case, the number of the liquidcrystal molecules RM aligned in the third direction D3 by the electricfield may be reduced, and thus, an alignment defect may occur. However,according to the present exemplary embodiment, the first upper alignmentdirection UD1 is substantially the same as the first lower alignmentdirection LD1, and the liquid crystal molecules RM are aligned in andinclined to the same direction. Therefore, the alignment defect may beprevented from occurring.

Accordingly, when an area in which the liquid crystal molecules RM arealigned by the first branch portions B1 is referred to as the firstdomain DM1, and a direction in which the liquid crystal molecules RM arealigned by the electric field in the first domain DM1 is referred to asa first liquid crystal alignment direction DR1, the first liquid crystalalignment direction DR1 in the first domain DM1 may correspond to thethird direction D3, which is the same as the first lower alignmentdirection LD1 and the first upper alignment direction UD1.

Referring to FIGS. 4B and 5, the second branch portions B2 extend in thefourth direction D4. When no electric field is formed between thedisplay substrate 100 (refer to FIG. 3A) and the opposite substrate 300(refer to FIG. 3A), a first portion of the liquid crystal molecules RM,which is adjacent to the first alignment layer 110, is aligned andinclined at a second pre-tilt angle A2 by the first alignment layer 110,and a second portion of the liquid crystal molecules RM, which isadjacent to the second alignment layer 310, is aligned and inclined atthe second pre-tilt angle A2 by the second alignment layer 310.

When a direction in which the liquid crystal molecules RM are aligned bythe first alignment layer 110 in a plan view is referred to as a secondlower alignment direction LD2, and a direction in which the liquidcrystal molecules RM are aligned by the second alignment layer 310 in aplan view is referred to as a second upper alignment direction UD2, thesecond upper alignment direction UD2 and the second lower alignmentdirection LD2 are substantially parallel to the fourth direction D4.That is, the second lower alignment direction LD2 and the second upperalignment direction UD2 are the same.

When the electric field is formed, the liquid crystal molecules RM arefurther inclined by the electric field. Thus, the liquid crystalmolecules RM are aligned in the fourth direction D4 to be substantiallyparallel to the second branch portions B2 in a plan view. Therefore, thesecond upper alignment direction UD2 and the second lower alignmentdirection LD2 are the same, and the liquid crystal molecules RM arealigned in the same direction in response to the electric field. As aresult, a second liquid crystal alignment direction DR2 in the seconddomain DM2 may correspond to the fourth direction D4, which is the sameas the second upper alignment direction UD2 and the second loweralignment direction LD2.

Referring to FIGS. 4C and 5, the third branch portions B3 extend in thefifth direction D5. When no electric field is formed between the displaysubstrate 100 (refer to FIG. 3A) and the opposite substrate 300 (referto FIG. 3A), a first portion of the liquid crystal molecules RM, whichis adjacent to the first alignment layer 110, is aligned and inclined ata third pre-tilt angle A3 by the first alignment layer 110, and a secondportion of the liquid crystal molecules RM, which is adjacent to thesecond alignment layer 310, is aligned and inclined at the thirdpre-tilt angle A3 by the second alignment layer 310.

When a direction in which the liquid crystal molecules RM are aligned bythe first alignment layer 110 in a plan view is referred to as a thirdlower alignment direction LD3, and a direction in which the liquidcrystal molecules RM are aligned by the second alignment layer 310 in aplan view is referred to as a third upper alignment direction UD3, thethird upper alignment direction UD3 and the third lower alignmentdirection LD3 are substantially parallel to the fifth direction D5. Thatis, the third lower alignment direction LD3 and the third upperalignment direction UD3 are the same.

When the electric field is formed, the liquid crystal molecules RM arefurther inclined by the electric field. Thus, the liquid crystalmolecules RM are aligned in the fifth direction D5 to be substantiallyparallel to the third branch portions B3 in a plan view. Therefore, thethird upper alignment direction UD3 and the third lower alignmentdirection LD3 are the same, and the liquid crystal molecules RM arealigned in the same direction in response to the electric field. As aresult, a third liquid crystal alignment direction DR3 in the thirddomain DM3 may correspond to the fifth direction D5, which is the sameas the third upper alignment direction UD3 and the third lower alignmentdirection LD3.

Referring to FIGS. 4D and 5, the fourth branch portions B4 extend in thesixth direction D6. When no electric field is formed between the displaysubstrate 100 (refer to FIG. 3A) and the opposite substrate 300 (referto FIG. 3A), a first portion of the liquid crystal molecules RM, whichis adjacent to the first alignment layer 110, is aligned and inclined ata fourth pre-tilt angle A4 by the first alignment layer 110, and asecond portion of the liquid crystal molecules RM, which is adjacent tothe second alignment layer 310, is aligned and inclined at the fourthpre-tilt angle A4 by the second alignment layer 310.

When a direction in which the liquid crystal molecules RM are aligned bythe first alignment layer 110 in a plan view is referred to as a fourthlower alignment direction LD4, and a direction in which the liquidcrystal molecules RM are aligned by the second alignment layer 310 in aplan view is referred to as a fourth upper alignment direction UD4, thefourth upper alignment direction UD4 and the fourth lower alignmentdirection LD4 are substantially parallel to the sixth direction D6. Thatis, the fourth lower alignment direction LD4 and the fourth upperalignment direction UD4 are the same.

When the electric field is formed, the liquid crystal molecules RM arefurther inclined by the electric field. Thus, the liquid crystalmolecules RM are aligned in the sixth direction D6 to be substantiallyparallel to the fourth branch portions B4 in a plan view. Therefore, thefourth upper alignment direction UD4 and the fourth lower alignmentdirection LD4 are the same and the liquid crystal molecules RM arealigned in the same direction in response to the electric field. As aresult, a fourth liquid crystal alignment direction DR4 in the fourthdomain DM4 may correspond to the sixth direction D6, which is the sameas the fourth upper alignment direction UD4 and the fourth loweralignment direction LD4.

According to the above, the first to fourth domains DM1 to DM4, whichare sequentially arranged in the second direction D2, are defined in thefirst sub-pixel area PA1. In this case, the liquid crystal alignmentdirections in which the liquid crystal molecules RM are aligned aredifferent from each other in the first to fourth domains DM1 to DM4.Accordingly, a viewing angle with respect to the first sub-pixel areaPA1 may be widened. In addition, although the electric field is notformed, the alignment defect does not occur in the first to fourthdomains DM1 to DM4 since the directions in which the liquid crystalmolecules RM are aligned by the first alignment layer 110 in the firstto fourth domains DM1 to DM4 are substantially the same as thedirections in which the liquid crystal molecules RM are aligned by thesecond alignment layer 310.

Similar to the first sub-pixel area PA1, the fifth to eighth domains DM5to DM8, which are sequentially arranged in the second direction D2, aredefined in the second sub-pixel area PA2, and liquid crystal alignmentdirections in which the liquid crystal molecules RM are aligned aredifferent from each other in the fifth to eighth domains DM5 to DM8. Inaddition, although the electric field is not formed, the alignmentdefect does not occur in the fifth to eighth domains DM5 to DM8, sincethe directions in which the liquid crystal molecules RM are aligned bythe first alignment layer 110 in the fifth to eighth domains DM5 to DM8are substantially the same as the directions in which the liquid crystalmolecules RM are aligned by the second alignment layer 310.

Hereinafter, the effect generated when the first to eighth domains DM1to DM8 are defined in the first and second sub-pixel areas PA1 and PA2will be described in detail with reference to the first domain DM1 andthe second domain DM2.

Referring to FIGS. 1C, 4A, and 5, misalignment may occur between thedisplay substrate 100 and the opposite substrate 300 when the curveddisplay device 500 is curved along the first direction D1. As a resultof this misalignment, the display substrate 100 and the oppositesubstrate 300 may be dislocated to each other by a first length L1.

However, because the first to eighth domains DM1 to DM8 are arranged inthe second direction D2 to be substantially perpendicular to the firstdirection D1 according to the present exemplary embodiment, thealignment defect caused by the misalignment does not occur in the firstdomain DM1.

In more detail, when an area in which the liquid crystal molecules RMare aligned by the first alignment layer 110 disposed on the displaysubstrate 100 is referred to as a lower alignment area AR1, and an areain which the liquid crystal molecules RM are aligned by the secondalignment layer 310 disposed on the opposite substrate 300 is referredto as an upper alignment area AR2, the liquid crystal molecules RM arealigned in the first lower alignment direction LD1 in the loweralignment area AR1 and are aligned in the first upper alignmentdirection UD1 in the upper alignment area AR2. In this case, when theopposite substrate 300 is shifted by the first length L1 as a result ofmisalignment, a position of the lower alignment area AR1 substantiallymatches with a position of the first domain DM1, but a position of theupper alignment area AR2 is shifted to the first direction D1 from theposition of the first domain DM1 by the first length L1.

In the present exemplary embodiment, even though the opposite substrate300 is shifted and the position of the lower alignment area AR1 does notpartially match with the position of the upper alignment area AR2, thelower alignment area AR1 is overlapped with the upper alignment area AR2in the first domain DM1. That is, the lower alignment area AR1 is notoverlapped with other upper alignment areas aligned in a directiondifferent from that of the upper alignment area AR2.

Therefore, the alignment defect caused by overlapping of the upperalignment area and the lower alignment area, which are aligned indifferent directions, may be prevented from occurring. Thus, reductionin the transmittance of the light passing through the first domain DM1may be prevented.

According to the structure of the first to eighth domains DM1 to DM8described above, the third and fourth domains DM3 and DM4 aresequentially arranged in the second direction D2 and disposed adjacentto the light blocking layer BM, and the fifth and sixth domains DM5 andDM6 face the third and fourth domains DM3 to DM4 while the lightblocking layer BM is disposed between the fifth and sixth domains DM5and DM6 and the third and fourth domains DM3 and DM4.

In the present exemplary embodiment, the third, fourth, first, andsecond liquid crystal alignment directions DR3, DR4, DR1, and DR2, whichare respectively defined in the third to sixth domains DM3 to DM6, aredifferent from each other, the third and fourth liquid crystal alignmentdirections DR3 and DR4 are oriented toward a first side E1 of thedisplay area DA (refer to FIG. 6), and the first and second liquidcrystal alignment directions DR1 and DR2 are oriented toward a secondside E2 (refer to FIG. 7) of the display area. In an exemplaryembodiment, first to fourth domains DM1 to DM4 each have smaller areasthan fifth to eighth domains DM5 to DM8, as shown in FIG. 5.

When the first to fourth liquid crystal alignment directions DR1 to DR4are defined as described above, a horizontal line may be prevented fromoccurring in the display area. Descriptions on the above will bedescribed in detail with reference to FIGS. 6 and 7.

FIG. 6 is an enlarged view showing a portion of the display area of thecurved display device shown in FIG. 1B. In detail, FIG. 6 shows a firstside E1 of the display area DA.

Referring to FIGS. 5 and 6, the pixel areas PA are defined in thedisplay area DA of the curved display device 500. As described withreference to FIG. 5, the first to eighth domains DM1 to DM8 are definedin each of the pixel areas PA, and the non-pixel area N-PA is definedbetween the fourth domain DM4 and the fifth domain DM5.

The pixel areas PA are arranged in a matrix in the display area DA.Thus, a line light blocking layer group BML, which includes lightblocking layers arranged in the first direction D1 in the non-pixel areaN-PA and including the light blocking layer BM (refer to FIG. 2), has aband shape having a first width WT1.

A first line domain group LDG1, including the third and fourth domainsDM3 and DM4, which are arranged in the first direction D1, is defined inthe pixel areas PA. A second line domain group LDG2, including the fifthand sixth domains DM5 and DM6, which are arranged in the first directionD1, is defined in the pixel areas PA. In this case, the first linedomain group LDG1 has a band shape having a second width WT2, and thesecond line domain group LDG2 has a band shape having a third width WT3.

When the first and second line domain groups LDG1 and LDG2 are definedas described above, the liquid crystal alignment directions DR3 and DR4(refer to FIG. 5) of the first line domain group LDG1 are orientedtoward the first side E1 of the display area DA. On the contrary, theliquid crystal alignment directions DR1 and DR2 (refer to FIG. 5) of thesecond line domain group LDG2 are toward the second side E2 (refer toFIG. 7), which faces the first side E1 of the display area DA.

Therefore, a refractive anisotropy of the liquid crystal moleculesdisposed in the first line domain group LDG1 may be different from arefractive anisotropy of the liquid crystal molecules disposed in thesecond line domain group LDG2, in accordance with the viewing angle atwhich the user sees the display area DA. As a result, grayscale leveldisplayed in the first line domain group LDG1 may be different from agrayscale level displayed in the second line domain group LDG2. Forinstance, as shown in FIG. 6, when the user sees the display area DA ata first viewing angle VA1, the grayscale level of the image displayed inthe first line domain group LDG1 may be darker than the f grayscalelevel of the image displayed in the second line domain group LDG2.

In this case, even though the first line domain group LDG1 and thesecond line domain group LDG2 are adjacent to the line light blockinglayer group BML, the grayscale level of the image displayed in thesecond line domain group LDG2 becomes brighter than the grayscale levelof the image displayed in the first line domain group LDG1 and the linelight blocking layer group BML. Thus, a width of the band in which thegrayscale level of the image is relatively dark is defined as a sum ofthe first width WT1 and the second width WT2 among the line lightblocking layer BML, the first line domain group LDG1, and the secondline domain group LDG2.

In contrast to the present exemplary embodiment, when the liquid crystalalignment directions in the first and second line domain groups LDG1 andLDG2 are oriented toward the first side E1, the grayscale levels of theimage displayed in the first and second line domain groups LDG1 and LDG2are the same. In this case, a width of the band in which the grayscalelevel of the image is relatively dark is defined as a sum of the first,second, and third widths WT1, WT2, and WT3. Thus, the width of the bandin which the grayscale level of the image is relatively dark becomesgreater by the third width WT3 compared to the present exemplaryembodiment. As a result, the band having the relatively dark grayscalelevel may be perceived by the user in accordance with the viewing angleand a viewing distance.

That is, according to the present exemplary embodiment, the width of theband, in which the grayscale level of the image is relatively dark, iscontrolled by adjusting at least one of the first width WT1 and thesecond width WT2 without considering the third width WT3. Accordingly,the width of the band defined by the sum of the first and second widthsWT1 and WT2 may be designed to be smaller than the width perceived bythe user.

FIG. 7 is an enlarged view showing a portion of the display area of thecurved display device shown in FIG. 1B. In detail, FIG. 7 shows thesecond side E2 of the display area DA.

Referring to FIGS. 5, 6, and 7, in contrast to the exemplary embodimentdescribed with reference to FIG. 6, when the user sees the display areaDA at a second viewing angle VA2, the grayscale level of the imagedisplayed in the second line domain group LDG2 may be darker than thegrayscale level of the image displayed in the first line domain groupLDG1 in FIG. 7, and the grayscale level of the image displayed in thefirst line domain group LDG1 may be brighter than the grayscale level ofthe image displayed in each of the line light blocking layer group BMLand the second line domain group LDG2. Thus, a width of the band, inwhich the grayscale level of the image is relatively dark, is defined bya sum of the first width WT1 and the third width WT3 among the linelight blocking layer group DML, the first line domain group LDG1, andthe second line domain group LDG2.

In contrast to the present exemplary embodiment, when the liquid crystalalignment directions in both the first and second line domain groupsLDG1 and LDG2 are toward the second side E2, the grayscale level of theimage displayed in the first line domain group LDG1 is substantially thesame as that of the image displayed in the second line domain groupLDG2. In this case, a width of the band, in which the grayscale level ofthe image is relatively dark, is defined by a sum of the first, second,and third widths WT1, WT2, and WT3. Thus, the width of the band in whichthe grayscale level of the image is relatively dark becomes greater bythe second width WT2 compared to the present exemplary embodiment. As aresult, the band having the relatively dark grayscale level may beperceived by the user in accordance with the viewing angle and a viewingdistance.

However, according to the present exemplary embodiment, the width of theband having the relatively dark grayscale level is controlled byadjusting at least one of the first width WT1 and the third width WT3without considering the second width WT2. Accordingly, the width of theband defined by the sum of the first and third widths WT1 and WT3 havingthe relatively dark grayscale level may be designed to be smaller thanthe width perceived by the user.

According to the exemplary embodiments described above, since thedomains defined in each pixel area are arranged in a direction crossingthe direction in which the display substrate and the opposite substrateare curved, reduction in the display quality of the curved displaydevice may be prevented even though misalignment may occur between thedisplay substrate and the opposite substrate.

In addition, a horizontal line, caused by the viewing angle of the user,may occur along the curved direction of the display substrate and theopposite substrate. However, a width of the horizontal line may beminimized by controlling liquid crystal alignment directions in thedomains disposed adjacent to the light blocking layer. Thus, reductionin the display quality of the curved display device as a result of thepresence of the horizontal line may be prevented.

Although certain exemplary embodiments and implementations have beendescribed herein, other embodiments and modifications will be apparentfrom this description. Accordingly, the inventive concept is not limitedto such embodiments, but rather to the broader scope of the presentedclaims and various obvious modifications and equivalent arrangements.

What is claimed is:
 1. A curved display device, comprising: a displaysubstrate comprising pixel areas defined in a display area, the displayarea being curved along a first direction when viewed in a plan view; anopposite substrate facing the display substrate, coupled to the displaysubstrate, and curved along the first direction together with thedisplay substrate; and a liquid crystal layer disposed between thedisplay substrate and the opposite substrate; a pixel electrode disposedin each of the pixel areas; a common electrode disposed on the oppositesubstrate and configured to form an electric field in cooperation withthe pixel electrode; and a light blocking layer disposed on one of thedisplay substrate and the opposite substrate and configured to blocklight, wherein: a plurality of domains is defined in each of the pixelareas, the domains being arranged in a single column in a seconddirection crossing the first direction for each pixel area, all of thedomains are parallel to each other, and each of the domains has a longside parallel to the first direction; liquid crystal molecules in afirst set of two domains, which are sequentially arranged and disposedadjacent to the light blocking layer among the domains, are aligned in adirection toward a first side of the display area; liquid crystalmolecules in a second set of two domains, which face the first set oftwo domains while the light blocking layer is disposed between the firstand second sets of two domain, are aligned in a direction toward asecond side of the display area wherein each of the domains in the firstset has the same width, wherein each of the domains in the second sethas the same width, and wherein the first width is smaller than thesecond width; a long side of each pixel area is parallel to the seconddirection; columns of domains adjacent to each other in the firstdirection have a same domain arrangement.
 2. The curved display deviceof claim 1, wherein the first and second sides of the display area faceeach other.
 3. The curved display device of claim 2, wherein the displayarea has a curved shape curved along the first direction.
 4. The curveddisplay device of claim 3, wherein the first direction is substantiallyperpendicular to the second direction.
 5. The curved display device ofclaim 1, wherein portions of the pixel electrode extend in a directioninclined with respect to the first and second directions when viewed ina plan view so as to define the domains.
 6. The curved display device ofclaim 1, wherein each of the pixel areas comprises a first sub-pixelarea and a second sub-pixel area, which are arranged in the seconddirection, and the light blocking layer is disposed between the firstsub-pixel area and the second sub-pixel area.
 7. The curved displaydevice of claim 6, wherein: liquid crystal alignment directions of theliquid crystal molecules in the domains defined in the first sub-pixelarea are different from each other; and liquid crystal alignmentdirections of the liquid crystal molecules in the domains defined in thesecond sub-pixel area are different from each other.
 8. The curveddisplay device of claim 6, wherein the pixel electrode comprises: afirst sub-pixel electrode disposed in the first sub-pixel area; and asecond sub-pixel electrode disposed in the second sub-pixel area,wherein the first sub-pixel electrode, the light blocking layer, and thesecond sub-pixel electrode are sequentially arranged in the seconddirection in the pixel area.
 9. The curved display device of claim 8,wherein the display substrate further comprises: a first data lineelectrically connected to the first sub-pixel electrode and configuredto apply a first data signal to the first sub-pixel electrode; and asecond data line electrically connected to the second sub-pixelelectrode and configured to apply a second data signal different fromthe first data signal to the second sub-pixel electrode.
 10. The curveddisplay device of claim 8, wherein: the domains comprise first, second,third, and fourth domains defined in the first sub-pixel area, andfifth, sixth, seventh, and eighth domains defined in the secondsub-pixel electrode; the first sub-pixel electrode comprises firstbranch portions disposed in the first domain, second branch portionsdisposed in the second domain, third branch portions disposed in thethird domain, and fourth branch portions disposed in the fourth domain;the second sub-pixel electrode comprises fifth branch portions disposedin the fifth domain, sixth branch portions disposed in the sixth domain,seventh branch portions disposed in the seventh domain, and eighthbranch portions disposed in the eighth domain; and the first to eighthbranch portions extend in a direction inclined with respect to the firstand second directions when viewed in a plan view.
 11. The curved displaydevice of claim 10, wherein the light blocking layer extends in thefirst direction.
 12. The curved display device of claim 10, wherein thelight blocking layer is disposed between the fourth domain and the fifthdomain.
 13. The curved display device of claim 10, wherein: liquidcrystal alignment directions of the liquid crystal molecules aligned bythe electric field in the first, second, seventh, and eighth domains aredifferent from each other; and liquid crystal alignment directions ofthe liquid crystal molecules aligned by the electric field in the third,fourth, fifth, and sixth domains are different from each other.
 14. Thecurved display device of claim 10, wherein: liquid crystal alignmentdirections of the liquid crystal molecules aligned by the electric fieldin the first, second, third, and fourth domains are different from eachother; and liquid crystal alignment directions of the liquid crystalmolecules aligned by the electric field in the fifth, sixth, seventh,and eighth domains are different from each other.
 15. The curved displaydevice of claim 10, wherein: liquid crystal alignment directions of theliquid crystal molecules aligned by the electric field in the third andfourth domains are oriented toward the first side of the display area;and liquid crystal alignment directions of the liquid crystal moleculesaligned by the electric field in the fifth and sixth domains areoriented toward the second side of the display area facing the one side.16. The curved display device of claim 8, wherein: the display substratefurther comprises shielding electrodes disposed in a non-pixel areaspaced apart from the pixel electrode; and each of the shieldingelectrodes forms a same electric potential with the common electrode.17. The curved display device of claim 16, wherein: each of theshielding electrodes extends in the second direction; and the first andsecond sub-pixel electrodes are disposed between two shieldingelectrodes adjacent to each other among the shielding electrodes andarranged in the second direction.
 18. The curved display device of claim1, wherein: the display substrate comprises a first alignment layerconfigured to align the liquid crystal molecules; the opposite substratecomprises a second alignment layer configured to align the liquidcrystal molecules; and liquid crystal alignment directions of the liquidcrystal molecules aligned by the first alignment layer are substantiallythe same as liquid crystal alignment directions of the liquid crystalmolecules aligned by the second alignment layer in each of the domains.19. The curved display device of claim 1, wherein the pixel areas arearranged in a matrix.
 20. A curved display device, comprising: a displaysubstrate comprising pixel areas defined in a display area, the displayarea being curved along a first direction when viewed in a plan view; anopposite substrate facing the display substrate, coupled to the displaysubstrate, and curved along the first direction together with thedisplay substrate; and a liquid crystal layer disposed between thedisplay substrate and the opposite substrate; a pixel electrode disposedin each of the pixel areas; a common electrode disposed on the oppositesubstrate and configured to form an electric field in cooperation withthe pixel electrode; and a light blocking layer disposed on one of thedisplay substrate and the opposite substrate and configured to blocklight, wherein: domains are defined in each of the pixel areas, thedomains being arranged in a single column in a second direction crossingthe first direction for each pixel area, all of the domains are parallelto each other, and each of the domains has a long side parallel to thefirst direction; and columns of domains adjacent to each other in thefirst direction have a same domain arrangement, wherein, in each pixelarea: a first one of the domains is disposed closest to a first side ofthe light blocking layer; a second one of the domains is disposedclosest to an opposing second side of the light blocking layer; liquidcrystals in the first domain and the second domain are aligned inopposite directions by the electric field the first ones of the domainshave the same width, the second ones of the domains have the same width,and wherein the first width is smaller than the second width; and a longside of each pixel area is parallel to the second direction.
 21. Thecurved display device of claim 20, wherein, in each pixel area: a thirdone of the domains is disposed directly adjacent to the first domain; afourth one of the domains is disposed directly adjacent to the seconddomain; liquid crystal molecules of the third domain are alignedsubstantially perpendicular to the liquid crystal molecules of the firstdomain; and liquid crystal molecules of the fourth domain are alignedsubstantially perpendicular to the liquid crystal molecules of thesecond domain by the electric field.
 22. The curved display device ofclaim 1, wherein each pixel area has four domains arranged in the seconddirection.